add driver for SHT20

Author: tyeth

src/components/i2c/WipperSnapper_I2C.cpp

@@ -338,6 +338,17 @@ bool WipperSnapper_Component_I2C::initI2CDevice(
     _sht4x->configureDriver(msgDeviceInitReq);
     drivers.push_back(_sht4x);
     WS_DEBUG_PRINTLN("SHT4X Initialized Successfully!");
+  } else if (strcmp("sht20", msgDeviceInitReq->i2c_device_name) == 0) {
+    _sht20 = new WipperSnapper_I2C_Driver_SHT20(this->_i2c, i2cAddress);
+    if (!_sht20->begin()) {
+      WS_DEBUG_PRINTLN("ERROR: Failed to initialize sht20!");
+      _busStatusResponse =
+          wippersnapper_i2c_v1_BusResponse_BUS_RESPONSE_DEVICE_INIT_FAIL;
+      return false;
+    }
+    _sht20->configureDriver(msgDeviceInitReq);
+    drivers.push_back(_sht20);
+    WS_DEBUG_PRINTLN("SHT20 Initialized Successfully!"); 
   } else if (strcmp("sht3x", msgDeviceInitReq->i2c_device_name) == 0) {
     _sht3x = new WipperSnapper_I2C_Driver_SHT3X(this->_i2c, i2cAddress);
     if (!_sht3x->begin()) {

src/components/i2c/WipperSnapper_I2C.h

@@ -30,6 +30,7 @@
 #include "drivers/WipperSnapper_I2C_Driver_PM25.h"
 #include "drivers/WipperSnapper_I2C_Driver_SCD30.h"
 #include "drivers/WipperSnapper_I2C_Driver_SCD40.h"
+#include "drivers/WipperSnapper_I2C_Driver_SHT20.h"
 #include "drivers/WipperSnapper_I2C_Driver_SHT3X.h"
 #include "drivers/WipperSnapper_I2C_Driver_SHT4X.h"
 #include "drivers/WipperSnapper_I2C_Driver_SHTC3.h"
@@ -95,6 +96,7 @@ class WipperSnapper_Component_I2C {
   WipperSnapper_I2C_Driver_SI7021 *_si7021 = nullptr;
   WipperSnapper_I2C_Driver_SHT4X *_sht4x = nullptr;
   WipperSnapper_I2C_Driver_SHT3X *_sht3x = nullptr;
+  WipperSnapper_I2C_Driver_SHT20 *_sht20 = nullptr;
   WipperSnapper_I2C_Driver_SHTC3 *_shtc3 = nullptr;
   WipperSnapper_I2C_Driver_LC709203F *_lc = nullptr;
   WipperSnapper_I2C_Driver_STEMMA_Soil_Sensor *_ss = nullptr;

src/components/i2c/drivers/WipperSnapper_I2C_Driver_SHT20.h

@@ -0,0 +1,99 @@
+/*!
+ * @file WipperSnapper_I2C_Driver_SHT20.h
+ *
+ * Device driver for the SHT20 Temperature and Humidity Sensor
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Adafruit Wippersnapper code Copyright (c) 2022 Adafruit Industries.
+ * SHT20 Driver code Copyright (c) DFRobot 2022. 
+ *
+ * MIT license, all text here must be included in any redistribution.
+ *
+ */
+
+#ifndef WipperSnapper_I2C_Driver_SHT20_H
+#define WipperSnapper_I2C_Driver_SHT20_H
+
+#include "WipperSnapper_I2C_Driver.h"
+#include <DFRobot_SHT20.h>
+#include <Wire.h>
+
+/**************************************************************************/
+/*!
+    @brief  Class that provides a driver interface for the SHT20 sensor.
+*/
+/**************************************************************************/
+class WipperSnapper_I2C_Driver_SHT20 : public WipperSnapper_I2C_Driver {
+
+public:
+  /*******************************************************************************/
+  /*!
+      @brief    Constructor for a SHT20 sensor.
+      @param    i2c
+                The I2C interface.
+      @param    sensorAddress
+                7-bit device address.
+  */
+  /*******************************************************************************/
+  WipperSnapper_I2C_Driver_SHT20(TwoWire *i2c, uint16_t sensorAddress)
+      : WipperSnapper_I2C_Driver(i2c, sensorAddress) {
+    _i2c = i2c;
+    _sensorAddress = sensorAddress;
+  }
+
+  /*******************************************************************************/
+  /*!
+      @brief    Initializes the SHT20 sensor and begins I2C.
+      @returns  True if initialized successfully, False otherwise.
+  */
+  /*******************************************************************************/
+  bool begin() {
+    DFRobot_SHT20 sht20(&Wire, SHT20_I2C_ADDR);
+
+    _SHT20 = new DFRobot_SHT20(_i2c, _sensorAddress);
+    delay(100);
+    return true;
+  }
+
+  /*******************************************************************************/
+  /*!
+      @brief    Gets the SHT20's current temperature.
+      @param    tempEvent
+                Pointer to an Adafruit_Sensor event.
+      @returns  True if the temperature was obtained successfully, False
+                otherwise.
+  */
+  /*******************************************************************************/
+  bool getEventAmbientTemp(sensors_event_t *tempEvent) {
+    // populate temp and humidity objects with fresh data
+    tempEvent->temperature = _SHT20->readTemperature();
+    // the driver returns a sketchy float if an error occurs, this could be caught
+    // here with a sensible range check and return false if not.
+    return true;
+  }
+
+  /*******************************************************************************/
+  /*!
+      @brief    Gets the SHT20's current relative humidity reading.
+      @param    humidEvent
+                Pointer to an Adafruit_Sensor event.
+      @returns  True if the humidity was obtained successfully, False
+                otherwise.
+  */
+  /*******************************************************************************/
+  bool getEventRelativeHumidity(sensors_event_t *humidEvent) {
+    // populate temp and humidity objects with fresh data
+    humidEvent->relative_humidity = _SHT20->readHumidity();
+    // the driver returns a sketchy float if an error occurs, this could be caught
+    // here with a sensible range check and return false if not.
+    return true;
+  }
+
+protected:
+  DFRobot_SHT20 *_SHT20; ///< SHT20 object
+};
+
+#endif // WipperSnapper_I2C_Driver_SHT20